Right here we go. Hopefully this is exactly what you want. These are from real flights GLA-LHR, figures in tonnes.
Boeing 767, approx 190 pax.
Taxi fuel 0.4
Trip fuel 4.6
Alternate fuel 1.9
Contingency fuel 0.5
Final reserve fuel 2.2
Total 9.6 tonnes.
Airbus A320, approx 150 pax.
Taxi fuel 0.2
Trip fuel 2.8
Alternate fuel 1.1
Contingency fuel 0.2
Final reserve fuel 1.1
Total 5.4 tonnes
Hope that helps.
As BOAC mentioned, 6 tonnes for a CAVOK day at LHR would be rather on the high side....